Enhance the security of your fastening applications with our External Tooth Lock Washer. Crafted from durable 316 Stainless Steel, this washer guarantees reliable performance and corrosion resistance. Meeting ASME B18.21.1 specifications, it ensures high quality and precision in its .6-inch outside diameter and .031-inch thickness. Designed for a hole size of 5/16, with an inside diameter of .326 inches, it provides a perfect fit for your fastening needs. Rest assured, this washer is RoHS compliant, making it an environmentally friendly and safe choice for your projects. Upgrade your fastening solutions with this essential component for optimal stability and peace of mind.